mysql2 does not properly return fields

[bizob2828]

Describe the bug
I'm trying to run the agent with mysql2 and I get errors when i do

connection.query('select * from foo;', (err, result, fields) => {
});

Looking at the instrumentation it is being a bit naive and only returning err and results.

Environment

• Operation system: N/A
• Node version: N/A
• Tracer version: v0.30.0
• Agent version: N/A